A variable is normally distributed with mean 21 and standard deviation 9. Use your graphing calculator to find each of the following areas. Write your answers in decimal form. Round to the nearest thousandth as needed. a) Find the area to the left of 22. b) Find the area to the left of 18. c) Find the area to the right of 20. d) Find the area to the right of 25. e) Find the area between 18 and 29. Check